mod·u·larmäjələr/adjectiveadjective: modular1 — employing or involving a module or modules as the basis of design or construction.2 — having parts that can be connected or combined in different ways.

3 — A modular grid system subdivides a page vertically and horizontally into margins, columns, inter-column spaces, lines of type, and spaces between blocks of type and images. These subdivisions form the basis of a modular and systematic approach to layout & design.